Whats the air pocket mean when candling?

[mvarty]

I candled eggs...not sure how old they are...for the first time. My light is not super bright, but I could clearly see a large air pocket on the end of all 6 eggs. whats this mean?

 

[rooster-red]

The air pocket is a natural occuring air supply for the chick as it pips the membrane so it will have enough time to pip the egg shell.